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GB836741A - Improved polymerisation process - Google Patents

Improved polymerisation process

Info

Publication number
GB836741A
GB836741A GB342358A GB342358A GB836741A GB 836741 A GB836741 A GB 836741A GB 342358 A GB342358 A GB 342358A GB 342358 A GB342358 A GB 342358A GB 836741 A GB836741 A GB 836741A
Authority
GB
United Kingdom
Prior art keywords
ammonium
water
perfluoro
sodium
weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB342358A
Inventor
Ronald Philip Smith
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB342358A priority Critical patent/GB836741A/en
Priority to FR1214766D priority patent/FR1214766A/en
Publication of GB836741A publication Critical patent/GB836741A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F14/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen
    • C08F14/18—Monomers containing fluorine
    • C08F14/26—Tetrafluoroethene

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Abstract

Aqueous colloidal dispersions of tetrafluoroethylene polymers are obtained by polymerizing tetrafluoroethylene in the presence of water containing a water-soluble catalyst and, as an ionizable dispersing agent, a water-soluble polyfluorinated sulphonic acid or salt having the formula RSO3X where R is either a radical CnF2n+1 or a radical having 4, 5 or 6 carbon atoms in a ring and the formula CnF2n-1, n being an integer from 4 to 18, and X is hydrogen, a metal ion, or ammonium or a substituted ammonium ion. Catalysts mentioned are peroxy compounds (e.g. ammonium and alkali metal persulphates, and disuccinic acid peroxide) and azo compounds, e.g. disodium gamma, gamma1 - azobis (gamma - cyanovalerate); suitable amounts being 0.001 to 0.5% by weight of the water. Dispersing agents specified are perfluoro n-pentane sulphonic acid, ammonium and potassium perfluoro-n-hexanesulphonates; sodium and potassium perfluoro-n-octanesulphonates; sodium perfluorocyclohexane-sulphonate; and sodium, potassium and ammonium perfluoro-4-methylcyclohexanesulphonates. The polymers may be tetrafluoroethylene homopolymers, or copolymers with up to 25 wt. per cent of another ethylenically unsaturated compound, e.g. vinyl or vinylidene fluoride, monochlorotrifluoroethylene, hexafluoropropylene, hexafluorocyclobutylene, ethylene or styrene. The dispersing agent may be added, preferably in amounts of 0.01 to 0.5% by weight of the water, before initiation of, or during the course of, the polymerization; in the latter case the first addition should be made before the polymer formed exceeds 10% by weight of the aqueous phase plus polymer. A stabilizer, e.g. 0.1 to 12 wt. per cent of a C12 or higher saturated hydrocarbon which is liquid under the polymerization conditions, e.g. octadecane, eicosane, tetradecane, cetane or paraffin wax, may be added before initiating the polymerization. The dispersions, prior to use for film-forming, coating or impregnation, may be concentrated by electrodecantation and may subsequently be baked above the sintering temperature (327 DEG C.).
GB342358A 1958-02-03 1958-02-03 Improved polymerisation process Expired GB836741A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB342358A GB836741A (en) 1958-02-03 1958-02-03 Improved polymerisation process
FR1214766D FR1214766A (en) 1958-02-03 1959-02-02 Process for the polymerization of tetrafluoroethylene in an aqueous medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB342358A GB836741A (en) 1958-02-03 1958-02-03 Improved polymerisation process

Publications (1)

Publication Number Publication Date
GB836741A true GB836741A (en) 1960-06-09

Family

ID=9758054

Family Applications (1)

Application Number Title Priority Date Filing Date
GB342358A Expired GB836741A (en) 1958-02-03 1958-02-03 Improved polymerisation process

Country Status (2)

Country Link
FR (1) FR1214766A (en)
GB (1) GB836741A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0072659A1 (en) * 1981-08-17 1983-02-23 E.I. Du Pont De Nemours And Company Continuous polymerization process
EP0103975A1 (en) * 1982-08-11 1984-03-28 E.I. Du Pont De Nemours And Company Process for the suspension polymerization of tetrafluoroethylene
US5244993A (en) * 1992-04-07 1993-09-14 The B. F. Goodrich Company Sulfate-terminated vinylidene fluoride polymers of controlled molecular weight
US5285002A (en) * 1993-03-23 1994-02-08 Minnesota Mining And Manufacturing Company Fluorine-containing polymers and preparation and use thereof
US5756620A (en) * 1995-11-15 1998-05-26 E. I. Du Pont De Nemours And Company Tetrafluoroethylene polymer for improved paste extrusion
US11066501B2 (en) * 2017-04-11 2021-07-20 Solvay Specialty Polymers Italy S.P.A. Method for manufacturing an aqueous latex comprising particles of a fluoropolymer
US11440981B2 (en) * 2006-11-09 2022-09-13 The Chemours Company Fc, Llc Aqueous polymerization of fluorinated monomer using polymerization agent comprising fluoropolyether acid or salt and short chain fluorosurfactant

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0072659A1 (en) * 1981-08-17 1983-02-23 E.I. Du Pont De Nemours And Company Continuous polymerization process
EP0103975A1 (en) * 1982-08-11 1984-03-28 E.I. Du Pont De Nemours And Company Process for the suspension polymerization of tetrafluoroethylene
US5244993A (en) * 1992-04-07 1993-09-14 The B. F. Goodrich Company Sulfate-terminated vinylidene fluoride polymers of controlled molecular weight
US5285002A (en) * 1993-03-23 1994-02-08 Minnesota Mining And Manufacturing Company Fluorine-containing polymers and preparation and use thereof
US5756620A (en) * 1995-11-15 1998-05-26 E. I. Du Pont De Nemours And Company Tetrafluoroethylene polymer for improved paste extrusion
US11440981B2 (en) * 2006-11-09 2022-09-13 The Chemours Company Fc, Llc Aqueous polymerization of fluorinated monomer using polymerization agent comprising fluoropolyether acid or salt and short chain fluorosurfactant
US11066501B2 (en) * 2017-04-11 2021-07-20 Solvay Specialty Polymers Italy S.P.A. Method for manufacturing an aqueous latex comprising particles of a fluoropolymer

Also Published As

Publication number Publication date
FR1214766A (en) 1960-04-12

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